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tests: add test for pivot_root in initramfs support
The only way to run in the proper initramfs is to start a VM using a custom initrd that runs runc. This should be a fairly reasonable smoke-test that matches what minikube and kata do. Unfortunately, running the right qemu for the native architecture on various distros is a little different, so we need a helper function to get it to work on both Debian and AlmaLinux. Signed-off-by: Aleksa Sarai <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,114 @@ | ||
| #!/usr/bin/env bats | ||
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| load helpers | ||
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| function setup() { | ||
| INITRAMFS_ROOT="$(mktemp -d "$BATS_RUN_TMPDIR/runc-initramfs.XXXXXX")" | ||
| } | ||
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| function teardown() { | ||
| [ -v INITRAMFS_ROOT ] && rm -rf "$INITRAMFS_ROOT" | ||
| } | ||
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| function qemu_native() { | ||
| # Different distributions put qemu-kvm in different locations and with | ||
| # different names. Debian and Ubuntu have a "kvm" binary, while AlmaLinux | ||
| # has /usr/libexec/qemu-kvm. | ||
| qemu_candidates=("kvm" "qemu-kvm" "/usr/libexec/qemu-kvm") | ||
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| qemu_binary= | ||
| for candidate in "${qemu_candidates[@]}"; do | ||
| "$candidate" -help &>/dev/null || continue | ||
| qemu_binary="$candidate" | ||
| break | ||
| done | ||
| # TODO: Maybe we should also try to call qemu-system-FOO for the current | ||
| # architecture if qemu-kvm is missing? | ||
| [ -n "$qemu_binary" ] || skip "could not find qemu-kvm binary" | ||
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| sane_run "$qemu_binary" "$@" | ||
| } | ||
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| @test "runc run [initramfs + pivot_root]" { | ||
| requires root | ||
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| # Configure our minimal initrd. | ||
| mkdir -p "$INITRAMFS_ROOT/initrd" | ||
| pushd "$INITRAMFS_ROOT/initrd" | ||
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| # Use busybox as a base for our initrd. | ||
| tar --exclude './dev/*' -xf "$BUSYBOX_IMAGE" | ||
| # Make sure that "sh" and "poweroff" are installed, otherwise qemu will | ||
| # boot loop when init stops. | ||
| [ -x ./bin/sh ] || skip "busybox image is missing /bin/sh" | ||
| [ -x ./bin/poweroff ] || skip "busybox image is missing /bin/poweroff" | ||
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| # Copy the runc binary into the container. In theory we would prefer to | ||
| # copy a static binary, but some distros (like openSUSE) don't ship | ||
| # libseccomp-static so requiring a static build for any integration test | ||
| # run wouldn't work. Instead, we copy all of the library dependencies into | ||
| # the rootfs (note that we also have to copy ld-linux-*.so because runc was | ||
| # probably built with a newer glibc than the one in our busybox image. | ||
| cp "$RUNC" ./bin/runc | ||
| readarray -t runclibs \ | ||
| <<<"$(ldd "$RUNC" | grep -Eo '/[^ ]*lib[^ ]*.so.[^ ]*')" | ||
| mkdir -p ./lib{,64} | ||
| cp -vt ./lib/ "${runclibs[@]}" | ||
| cp -vt ./lib64/ "${runclibs[@]}" | ||
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| # Create a container bundle using the same busybox image. | ||
| mkdir -p ./run/bundle | ||
| pushd ./run/bundle | ||
| mkdir -p rootfs | ||
| tar --exclude './dev/*' -C rootfs -xf "$BUSYBOX_IMAGE" | ||
| runc spec | ||
| update_config '.process.args = ["/bin/echo", "hello from inside the container"]' | ||
| popd | ||
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| # Build a custom /init script. | ||
| cat >./init <<-EOF | ||
| #!/bin/sh | ||
| set -x | ||
| echo "==START INIT SCRIPT==" | ||
| mkdir -p /proc /sys | ||
| mount -t proc proc /proc | ||
| mkdir -p /sys | ||
| mount -t sysfs sysfs /sys | ||
| mkdir -p /sys/fs/cgroup | ||
| mount -t cgroup2 cgroup2 /sys/fs/cgroup | ||
| mkdir -p /tmp | ||
| mount -t tmpfs tmpfs /tmp | ||
| mkdir -p /dev | ||
| mount -t devtmpfs devtmpfs /dev | ||
| mkdir -p /dev/pts | ||
| mount -t devpts -o newinstance devpts /dev/pts | ||
| mkdir -p /dev/shm | ||
| mount --bind /tmp /dev/shm | ||
| runc run -b /run/bundle ctr | ||
| echo "==END INIT SCRIPT==" | ||
| poweroff -f | ||
| EOF | ||
| chmod +x ./init | ||
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| find . | cpio -o -H newc >"$INITRAMFS_ROOT/initrd.cpio" | ||
| popd | ||
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| # Now we can just run the image (use qemu-kvm so that we run on the same | ||
| # architecture as the host system). We can just reuse the host kernel. | ||
| qemu_native \ | ||
| -initrd "$INITRAMFS_ROOT/initrd.cpio" \ | ||
| -kernel /boot/vmlinuz \ | ||
| -m 512M \ | ||
| -nographic -append console=ttyS0 | ||
| [ "$status" -eq 0 ] | ||
| [[ "$output" = *"==START INIT SCRIPT=="* ]] | ||
| [[ "$output" = *"hello from inside the container"* ]] | ||
| [[ "$output" = *"==END INIT SCRIPT=="* ]] | ||
| } |